复合制粒烧结过程中铁氧化物与CaO和MgO等熔剂的矿化行为研究

为了既降低固体燃耗和CO2排放量，又能改善烧结矿强度和还原性，且熔剂使用量减少，国内外冶金学者提出了燃料与熔剂外配的复合制粒技术。本课题拟在前人研究的基础上，结合热力学基础理论和高温试验，对复合制粒条件下铁氧化物与CaO、MgO等熔剂的矿化反应进行深入系统地基础理论研究。具体内容包括：（1）CaO在铁氧化物中的扩散速度及铁酸钙粘结相的生成能力、流动性和表面张力；（2）铁氧化物中MgO的扩散速度；（3）铁氧化物的再结晶性能等。同时，考察了CaO、MgO、SiO2、Al2O3等对铁氧化物矿化反应的影响，并采用现代测试技术从微观结构方面对试验结果进行机理解释，从而明确复合制粒烧结条件下，Fe2O3-CaO系、Fe2O3-MgO系、Fe2O3-Fe2O3系等的矿化反应机理。本课题的实施可为燃料、熔剂外配的复合制粒烧结技术提供科学的理论依据。

Aimed to decrease fuel consumption, CO2 emission and flux consumption, also improve the strength and reducibility of sinter, the technology of multi-granulation coated by fuel and flux for sintering process is developed by worldwide metallurgist. Based on the literature review of previous researchers, the mineralizing process between iron oxides and CaO or MgO will be investigated in this project by combining thermodynamics analysis and high-temperature experiments. The detailed contents include (1) the diffusion rate of CaO in iron oxides, and the generative capacity, fluidity, and surface tension of calcium ferrite, (2) the diffusion rate of MgO in iron oxides. (3) recrystallization of iron oxides. Also, the effects of CaO、MgO、SiO2、Al2O3 on the mineralization of iron oxides and the fundamentals about the above experimental results will be investigated by using modern measuring technologies. So, the mineralizing mechanisms of Fe2O3-CaO、Fe2O3-MgO、Fe2O3-Fe2O3 will be clarified under the condition of multi-granulation coated by fuel and flux. Therefore, the research content of this project will give a scientific guide for the practical application of the technology of multi-granulation coated by fuel and flux for sintering process.